Penn Jillette:
[Penn explains why there is so much vulgarity on the show] You'll notice more obscentity than we usually use. That's not just because it's on Showtime, and we want to get some attention. It's also a legal matter. If one calls people liars and quacks, one can be sued and lose a lot of one's money. But "motherfuckers" and "assholes" is pretty safe. If we said it was all scams, we could also be in trouble. But BULLSHIT, oddly, is safe.So forgive all the bullshit language. We're trying to talk about the truth without spending the rest of our lives in court because of litigious motherfuckers!